Does the test piece need to be disconnected from the ground when testing the circuit breaker switch?

Does the test piece need to be disconnected from the ground when testing the circuit breaker switch?

There are currently two types of loop resistance testers. The first type must disconnect the ground of the circuit breaker during on-site testing, otherwise the test cannot be performed. The second type is a double-end grounded loop resistance tester, which can be tested without disconnecting the ground during on-site testing.